On Sat, 29 Oct 2016 20:41:48 +0200, you wrote:
>On Sat, 29 Oct 2016 15:27:49 +0100
>"Dr. David Kirkby (Kirkby Microwave Ltd)"
>wrote:
>
>> But if one could use copper as the bond wire, rather than gold which is
>> quite common, then it would give you very little
Am Sat, 29 Oct 2016 20:41:48 +0200
schrieb Attila Kinali :
> On Sat, 29 Oct 2016 15:27:49 +0100
> "Dr. David Kirkby (Kirkby Microwave Ltd)"
> wrote:
>
> > But if one could use copper as the bond wire, rather than gold
> > which is quite common,
Am Sun, 30 Oct 2016 01:05:56 -0500
schrieb David :
> Sounds more like copper free copper than oxygen free copper.
To be fair, one does not exclude the other. And nobody specified to what
the 100% is supposed to apply to. Being oxygen free does not necessarily
imply that it
On Sat, Oct 29, 2016 at 03:27:49PM +0100, Dr. David Kirkby (Kirkby Microwave
Ltd) wrote:
> Perhaps the person who was making the measurements on the solder, could try
> making a thermocouple by welding two bits of wire taken from different
> sources. I guess the problem would be preventing any
good one.
On Sat, Oct 29, 2016 at 11:05 PM, David wrote:
> Sounds more like copper free copper than oxygen free copper.
>
> On Sun, 30 Oct 2016 01:06:12 +, you wrote:
>
> >Once you get past 99.99% purity funny things begin to happen... I have
> some 100% pure Cu
Sounds more like copper free copper than oxygen free copper.
On Sun, 30 Oct 2016 01:06:12 +, you wrote:
>Once you get past 99.99% purity funny things begin to happen... I have some
>100% pure Cu oxygen free cable (says so right on the jacket) made in China
>that is magnetic! You can't do
Googling for "Things I Won't Work With" finds the article and others by Derek
Lowe in his blog.
John K1AE
-Original Message-
From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Mark Sims
Sent: Saturday, October 29, 2016 1:38 AM
To: volt-nuts@febo.com
Subject: [volt-nuts]
On Sat, 29 Oct 2016 15:27:49 +0100
"Dr. David Kirkby (Kirkby Microwave Ltd)"
wrote:
> But if one could use copper as the bond wire, rather than gold which is
> quite common, then it would give you very little thermal EMF
Copper is more and more used for bonding
On 29 October 2016 at 14:51, NeonJohn wrote:
>
>
> On 10/28/2016 08:39 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
>
> > I wonder how practical it is to weld test leads, so there's no solder or
> > thermal EMF.
> >
> > I know that this will sound crazy, and probably
On 10/28/2016 08:39 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
> I wonder how practical it is to weld test leads, so there's no solder or
> thermal EMF.
>
> I know that this will sound crazy, and probably is, but could one weld
> components to a PCB?
Yes indeed. About 20 years ago I
probably because they drowned some lab rats with solutions of the stuff.
As we say in the health-physics business, "the devil's in the dose". If
I were working in a cad plating outfit, yeah, I'd check into what is
behind the IARC's somewhat arbitrary designation.
Making a small batch of cad
On Sat, 29 Oct 2016 01:39:12 +0100, you wrote:
>On 28 Oct 2016 15:25, "Juris L" wrote:
>
>I wonder how practical it is to weld test leads, so there's no solder or
>thermal EMF.
>
>I know that this will sound crazy, and probably is, but could one weld
>components to a PCB?
>
>I
Typing on phone... If the bond wires are gold they still are dissimilar to
pcb copper, but if they were copper bond wires, thermal gradients would be
less of an issue.
On Friday, 28 October 2016, Scott Stobbe wrote:
> "chip on board", not sure that it wouldnt help
>
>
"chip on board", not sure that it wouldnt help
On Friday, 28 October 2016, Dr. David Kirkby (Kirkby Microwave Ltd) <
drkir...@kirkbymicrowave.co.uk> wrote:
> On 28 Oct 2016 15:25, "Juris L" > wrote:
> >
> > Found reference to optimal emf solder composition
I note that I weld thermocouples.
hld
Howard L. Davidson
hl...@att.net
From: Dr. David Kirkby (Kirkby Microwave Ltd)
<drkir...@kirkbymicrowave.co.uk>
To: Discussion of precise voltage measurement <volt-nuts@febo.com>
Sent: Friday, October 28, 2016 5:39 PM
Subject: Re
Laser welding should work for either similar or dissimilar materials.At one
time microwire PCBs used stainless steel wires were welded to stainless lands.
Bruce
On Saturday, 29 October 2016 1:39 PM, Dr. David Kirkby (Kirkby Microwave
Ltd) wrote:
On
On 28 Oct 2016 15:25, "Juris L" wrote:
>
> Found reference to optimal emf solder composition cadmium/tin alloy
> (70 %/30 %) in JJ array measurement article page 12.
I wonder how practical it is to weld test leads, so there's no solder or
thermal EMF.
I know that this will
In message , NeonJohn
writes:
>Let's don't get carried away with cadmium toxicity. Yes, it is toxic is
>sufficient dose but the LD50 dose for Cd is 750 mg/kg while the value
>for lead is around 450mg/kg.
Read how a professional
LD50 is not the only consideration. From Wikipedia:
"The International Agency for Research on Cancer has classified cadmium and
cadmium compounds as carcinogenic to humans."
FWIW
Neville Michie
> On 29 Oct 2016, at 8:09 AM, NeonJohn wrote:
>
> Let's don't get carried
Let's don't get carried away with cadmium toxicity. Yes, it is toxic is
sufficient dose but the LD50 dose for Cd is 750 mg/kg while the value
for lead is around 450mg/kg.
As far as dumping it in a solder pot, that works just fine for me. It's
cheaper to buy 50/50 plumber's bar solder and then
I would recommend against trying to use cadmium - it's very toxic, which
is why Cd-based solders are rare nowadays. They are probably still made,
but for lab or industrial use with proper handling. If you try to alloy
it with Sn yourself without proper handling, you could get poisoned. You
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